I started developing Ride in the spring of 2018, originally as a way to test R code meant to run in the Renjin ScriptEngine interactively but soon evolved into a full blown IDE.
It supports syntax highlighting, code suggestion, ability to run partial code snippets, maven and git support etc. etc. SQL, Java and Groovy development are also supported.
Ride supports three different themes, bright, dark and blue (seen above)
SQL support is also quite advanced making Ride an excellent tools for data analysis as well as a great way to develop R projects and/or Packages targeted for use in Renjin R. Below is a screenshot (Ride is set to the bright theme):
Ride can be downloaded here: https://github.com/perNyfelt/ride/releases/latest